crash-reporter: Add diagnostics to help diagnose failures in the wild

system_logging_mock.h

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CRASH_REPORTER_SYSTEM_LOGGING_MOCK_H_
 #define CRASH_REPORTER_SYSTEM_LOGGING_MOCK_H_
 
 #include <string>
 
 #include "crash-reporter/system_logging.h"
 
 class SystemLoggingMock : public SystemLogging {
  public:
   void Initialize(const char *ident) {}
   virtual void LogInfo(const char *format, ...);
   virtual void LogWarning(const char *format, ...);
   virtual void LogError(const char *format, ...);
+  virtual void set_accumulator(std::string *accumulator);
 
   const std::string &log() { return log_; }
 
   void clear() { log_.clear(); }
 
  private:
   static std::string identity_;
   std::string log_;
   std::string ident_;
 };
 
 #endif  // CRASH_REPORTER_SYSTEM_LOGGING_H_